JPH0433250Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a device for attaching and detaching a case cover of a CPU of a programmable controller or an input/output unit case, for example.

[Conventional technology]

FIG. 5 shows a partially cutaway perspective view of a conventional case lid attaching/detaching device of this type. In the figure, 1 is a case lid, and 2 is a case body to which this lid 1 is closed. Reference numeral 3 designates a plurality of elastically deformable engaging parts (three in the embodiment, but only two shown in the figure) protruding downward from the joint part of the case lid 1 with the main body 2, and 4 a case main body. The above-mentioned engaging portions 3 provided in 2 are engagement holes that engage with each other.

The conventional attachment/detachment device is constructed as described above, and when the lid 1 is closed to the case body 2, the protrusion 3a of the engaging part 3 comes into pressure contact with the inner surface of the case body 2 and moves inward. After being elastically deformed, the protrusion 3a engages with the insertion hole 4, and the engaging part 3 elastically returns to the lid body 1.
The assembly of the main body 2 and the main body 2 is completed.

[Problem that the invention attempts to solve]

Since the conventional attachment/detachment device is configured as described above, for example, in order to detach the lid 1 from the case body 2 for some reason, the protrusion 3a of the engaging part 3 is pushed back inward through the insertion hole 4. This is to release the engagement with the engagement hole 4, but the lid cannot be removed unless all the engagement points are released at once, so if there are multiple engagement points, it is difficult to release them at the same time. There were some problems, such as:

This idea was made in order to solve the above-mentioned problems, and aims to provide a case lid attaching/detaching device that is simple and easy to handle even when there are many engagement points. purpose.

[Means for solving problems]

The attachment/detachment device according to this invention is provided with an elastically deformable stopper plate having an engagement step on the inner surface adjacent to the left and right sides of the engagement part, and is engaged by pushing the engagement part back to the outer surface of the engagement part. It is provided with a protrusion that engages with the engagement step when it is removed from the entrance hole.

[Effect]

In the attachment/detachment device of this invention, when the engaging part is elastically deformed so as to be pushed back inward from the engagement hole and disengaged from the engagement hole, the protrusion of the engagement part engages with the engagement stepped part of the stopper plate. As a result, the engaging portion can maintain its released state, and the lid can be removed without any problems.

〔Example〕

1 and 2 are perspective views of a case lid showing an embodiment of this invention, viewed from the front and back, respectively.The case lid of a programmable controller or the like will be described below as an example. In the figure, reference numeral 1 denotes a case lid, and 3 denotes a plurality of elastically deformable engaging portions (three in this embodiment) that protrude downward from the joint portion of the case lid 1 with the case body (not shown). 3a is the protrusion. Reference numeral 5 denotes an elastically deformable stopper plate that stands adjacent to the left and right side parts of each engaging part 3, and an engaging step part 6 is provided on the inner surface of this stopper plate 5.
is provided. Reference numeral 7 denotes a protrusion protruding from the outer surface of each engaging portion 3. When the engaging portion 3 is elastically deformed and pushed back, the protrusion 7 detaches from the engaging hole of the case body and engages with the engaging stepped portion 6. At the same time, the engaging portion 3 is maintained in the released state. Note that the engaging portion 3 deforms inward when the lid 1 is engaged with the engagement hole of the case body, but the amount of deformation at that time does not allow the above-mentioned protrusion 7 to engage with the engagement stepped portion 6 of the stopper plate 5. The dimensions are designed.

Next, the operation of this invention will be explained. FIG. 3 is a plan view showing the state in which the engaging portion 3 of the case lid 1 is engaged with the engagement hole 4 of the case body shown by the imaginary line, and the case lid 1 is removed from this state. First, when the protrusion 3a of the engagement part 3 is pushed back inward from the outside of the engagement hole 4 with a finger or the like, the engagement part 3 is elastically deformed and retreats, and the protrusion 7 provided on the side surface of the engagement part 3 moves back into the stopper plate 5. While pushing it open slightly, it engages with the engagement step 6 as shown in FIG. As a result, the engaging portion 3 remains detached from the insertion hole 4 and stops, so that the case lid 1 can be removed from the case body by simply lifting it. When attaching the case lid 1 to the case body again, by slightly opening the stopper plate 5 outward, the engaging portion 3 can be returned to its original position by elastic return.

In this invention, in order to prevent the engaging part 3 from being pushed back too strongly and breaking when the lid body 1 is removed, a patch plate 8 is placed behind the engaging part 3 as shown by the imaginary line in FIG. Even if the part 3 is pressed too strongly, it will not come into contact with the backing plate 8 and be further deformed, so there is an advantage that breakage of the engaging part 3 can be prevented.

Further, in the embodiment of this invention, an example in which the engaging part 3 is provided on the case lid 1 side has been described, but the engaging part may be provided on the case body side and the engagement hole may be provided on the lid 1 side. Furthermore, the case lid is not limited to programmable controllers, and can be widely applied to other case lid attaching/detaching devices.

[Effect of idea]

As described above, according to this invention, when removing the case lid, the engaging part is stopped so as to maintain the detached state from the engaging hole, so it is easy to remove even when there are many engaging parts. Moreover, the case lid body can be easily handled and quickly removed. Furthermore, since the structure is simple, it can be manufactured at low cost.

[Brief explanation of the drawing]

Figures 1 and 2 are front and back perspective views of a case lid equipped with an attachment/detachment device showing one embodiment of this invention, and Figure 3 shows the engagement with the engagement hole of the engaging part. FIG. 4 is a plan view showing the state, FIG. 4 is a plan view showing the detached state, and FIG. 5 is a perspective view of the case lid and case body showing a conventional attaching/detaching device. DESCRIPTION OF SYMBOLS 1...Case lid, 3...Latching part, 3a...Protrusion, 4...Engagement hole, 5...Stopper plate, 6...Engagement step, 7...Protrusion, 8...Batch plate In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] An attachment/detachment device that is provided with an elastically deformable engaging part on one side of the case body and a lid that closes it, and a plurality of attachment/detachable parts each having an engagement hole in which the engaging part engages on the other side. In the device, an elastically deformable stopper plate having an engaging stepped portion on the inner surface adjacent to the left and right side portions of each of the engaging portions is provided, and the engaging portion is moved from the engaging hole in the release direction on the outer surface of the engaging portion. 1. A device for attaching and detaching a case lid body, characterized in that a protrusion is provided that engages with the engaging step portion and maintains the engaging portion in a released state when the case lid is deformed.